Or better yet, get Windows Server 2003 Datacenter and you can host unlimited VMs per Host. Windows Server 2003 Standard is a 1 VM to 1 license per VM Windows Server 2003 Enterprise is 4 VMs to 1 license per Host (includes Host license if host is W2k3 Enterprise) Windows Server 2003 DataCenter is unlimited VMs to 1 license per Host In the case of DataCenter, you would downgrade to Enterprise for the install. As far as 2003 vs XP\Vista. It all depends on what your trying to accomplish with VDI. For the most part, traditional SBC is the way to go but there are applications that just don't run on 2003. Only XP and\or Vista. Also, in the context of Citrix, XenDesktop will provide a better experience using XP\Vista than Presentation Server and 2003. Even if everyone has their own 2003 instance. Joe _____ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Greg Reese Sent: Saturday, May 03, 2008 11:18 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Licensing Vista for VDI - Are you ready for VDI Maybe not in other words, they just want us to keep buying desktops from authorized resellers like Dell and HP and keep sending them money on SA deals. the only way to know you are correctly licensing Microsoft's products is to figure out the absolute most expensive scenario possible. That will be the one that is compliant. :^) the ony way I can see to come out ahead is to virtualize with 2003 enterprise and run your five free windows 2003 standard virtually as terminal servers. Heck, you would almost be better off to VDI everyone their own 2003 server rather than XP or Vista. Greg On Fri, May 2, 2008 at 6:54 PM, Jim Kenzig <jkenzig@xxxxxxxxx> wrote: Wait as I thought about this XP is licensed per device it is installed on. Theoretically if you used PC blades and used 1 copy on each blade you might be compliant. There is no way you could do it with multiple users accessing one VDI being licensed properly though with out buying VECD and downgrading. Vista Business/Ultimate VECD is the only authorized MS OS license that lets you virtualize to multiple users and multiple desktops at the same time as far as I know. On Fri, May 2, 2008 at 6:20 PM, Joe Shonk <joe.shonk@xxxxxxxxx> wrote: What's the alternative? Use a full blown license for each instance? I have customer who has extra XP licenses they wish to pool in this fashion. Joe _____ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Kenzig Sent: Friday, May 02, 2008 4:15 PM To: THIN; virtualize Subject: [THIN] Licensing Vista for VDI - Are you ready for VDI Maybe not If you want to use Vista as a Virtual Desktop Infrastructure (VDI) heads up. Did you know that only the Windows Vista Enterprise Centralized Desktop (VECD) version of Vista can be used this way. Here is a document that has the skinny. http://download.microsoft.com/download/3/d/4/3d42bdc2-6725-4b29-b75a-a5b0417 9958b/licensing_vista_with_VM_technologies.docx So as I understand it after you pay get the Hyper-V, Or Vmware VDI or Citrix Desktop solution license and server hardware, you'll need to of course pay for the local Windows Vista license the VECD one on the device so you can run a vista VDI. It gets very confusing. But the buttom line is if you aren't running VECD when accessing Vista in a VDI you are violating Microsofts licensing agreement. Hope you purchased the correct version. Are you confused now? I still am. But I always thought that the synonym for Microsoft licensing is "Confusion". That is why we have VARs. LOL -- Jim Kenzig Microsoft MVP - Terminal Services Citrix Technology Professional Blog: http://www.techblink.com <http://www.techblink.com/> -- Jim Kenzig Microsoft MVP - Terminal Services Citrix Technology Professional Blog: http://www.techblink.com